This is a special room. Under control of the two health care workers who were sick at the same time same hospital as the man with -- Tested negative for the deadly virus today hello I'm Michelle Franzen in New York. Doctors are carefully looking at a possible outbreak of rumors -- the Middle Eastern respiratory syndrome. After a medical professional visiting from Saudi Arabia had to be hospitalized. And isolated. Meantime the Centers for Disease Control still trying to track down 100 people who might have been exposed because of the medical workers travels two weeks ago. ABC's Scott Goldberg has been following the latest developments and has this report. Health officials are tracking down hundreds of passengers who shared a may first flight with that Florida patient diagnosed with murders. The centers for disease controls posting these warnings -- 22 of the nation's busiest airports. Telling passengers to wash their hands not to touch their faces and to avoid close contact with sick people. We travel a lot so that is pretty concerning. The infected passenger who works as a health care provider in Saudi Arabia flew from Jeddah into Boston through Atlanta finally arriving in Orlando. The 44 year old was treated for flu like symptoms to hospitals there. To health care workers who took care of him at first showed -- symptoms but have since tested negative for the violence. Twenty other hospital workers who came in contact with the infected man we're told to stay home for two weeks as a precaution officials are also warning nearly a hundred people who may have been exposed in a hospital waiting room. The risk is negligible so this community. I think the risk is negligible to those who were in the waiting room CDC believes -- spreads through close contact over long periods of time. This is a relatively new virus and there's no specific anti viral medicine and there's no vaccine. The Florida case is the second murders case in the US the man diagnosed with the first -- related case in Indiana is now out of the hospital. Scott Goldberg ABC news New York. We -- joined now via Skype ABC news medical contributor doctor mark -- demolish. Give us an idea of the hospital has said that nobody else has contracted that virus but that doesn't mean it's all clear what -- doctors looking for and waiting for at this point. That's right Michelle so we know the patient is doing well. Having a -- -- appears to be getting better. We also know that two workers that where potentially exposed also tested negative while we don't know there there are eighteen other health care workers. That we're still waiting to see if they developed any symptoms. But we have another little bit of good news is we're sort of on the tail end of the fourteen day incubation period from -- patients -- that it really good news. So that would be sort of a deadline are telltale sign that. They may have not been exposed -- contracted that virus. Right and he's also likely not to be infectious anymore. You know another thing that we learned today. The World Health Organization has obviously paying attention to decimate met yesterday -- a press conference today. And they're telling us that -- you know it's not a public help emergency but this is a serious. Issue to be concerned about and they want everywhere around the world to really keep your guard up on -- respiratory infectious diseases. And we've seen some of those pamphlets starting to go out at airports and you mentioned at the World Health Organization. Has said that is not something that everyone needs to be alarmed about but alert about how easily is it to contract this virus especially for medical staff. Right so you know the good news is that for most of us it's not very easy to contract the virus for two reasons why we're not a hot -- or -- And two -- not a health care worker you're not likely to be in close enough contact. Now what we do know is that the disease is mostly spread through cough and cough -- and cough -- he can think about sort of go anywhere from three feet. You know beyond a person -- -- so that's an important thing to keep not you know keep a safe distance from those who are sick having a -- -- -- you know. That's -- -- be really important it's smaller drop us a little bit earlier than three feet and three feet a sort of a good number to stay away if somebody's offering next you. The Centers for Disease Control says it would like to examine about 100 people that might have been exposed how hard is it to track all of these people down. And you mentioned time is of a concern. Rights of the people on -- -- Are a little easier to track down people on the waiting Graham and hospitals. And hallways and whether or not it's easy to track down and so the key thing here is for people in those areas have been in -- Orlando hospital. To pay attention to their symptoms that timing. You know it'd be taking their temperature they feel ill and to really being tuned in we have a fever chills even a little bit about that -- sometimes they can -- as diarrhea so. You know. They really -- need to be aware that they're still -- two to fourteen to -- period but hopefully not. Much longer. And -- deadly -- this virus be -- mean certainly it's a concern in many countries around the world already even though cases are just now coming here. Yes obviously this is very important concern and we probably wouldn't be talking about it if it wasn't deadly unfortunately. 13 or nearly 13 30% of people who have -- virus. Due unfortunately passed away from this so it is a deadly virus and we do want to do our best to keep it contained and with. That could you remind us again what are the symptoms they're sound very. Familiar like flu like symptoms. Exactly they are the flu like symptoms fever chills runny nose you know little bit upset some -- so any of these upper respiratory symptoms you have that it into an -- -- area or health care worker who. Is around people have been to those areas. Certainly you want to pay attention to their sentencing contact your health care provider. Of course summer travel is heating up and travel to Saudi Arabia -- also pick up this summer because of religious pilgrimages. Our officials taking any more precautions because of this. That's a really good point you know every year about two million people. Visit Saudi Arabia for religious reasons including about 111000 Americans every year and so it is very important to you be. You know cautious when you're going to these areas you know not being around sick people again washing -- hands and protecting yourself if you find yourself -- that situation you know you also there's no specific travel restrictions yet from the CDC. -- the World Health Organization but if you are planning a trip he really want to be in tune to those recommendations to make sure they're not changing. And then finally you know if you are going to be in those areas again stay away from -- people who are -- and you know -- necessary precautions. ABC's medical care contributor doctor mark got demolished thank you for joining us. Here's keep up with this story in real time by downloading the ABC news that -- starring this story for exclusive updates on the go. For now I'm Michelle Franzen in New York.

This transcript has been automatically generated and may not be 100% accurate.

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